JPH0441880A - Push latch device - Google Patents

Abstract

PURPOSE:To simplify the structure by forming the channel bottom of a heart- shaped cam channel forming a cam mechanism and received in a latch case into a flat passage, and dispensing with a pin energizing spring body for energizing the driven pin of a driven element. CONSTITUTION:A push latch device is formed of a latch case 1, a latch sliding body 5, a latch driving spring body 11, and a cam mechanism. The cam mechanism is formed of a channel 12 having a flat channel bottom 13b on the bottom cap plate 1a of case 1 and a plate driven element 15 having a driven pin 16 guided by the channel 13. When an opened door body is closed, the sliding body 5 is retreated, and the pin 16 is touched onto the recessed wall d1 of the heart-shaped outer circumferential wall 13c of the channel 13 while rotating. When the pushing force is released, the pin 16 is engagingly locked by a recessed part e1 to keep the door body in closed state by a magnet member 10. When the door body is further pushed in, the pin 16 is moved along the wall 13c to bring the cap body into releasable state. Thus, no pin energizing spring body is required, and the structure can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a push latch device. Here, the push latch device means, for example, when a door body with one end hinged is rotated and closed, it is latched at the free end side, and when the door body is pushed in and released, the latch is released. A device equipped with a mechanism that pushes out the free end of the door in the opening direction.

<Prior art> As a push latch device of the above type, Japanese Patent Application Laid-Open No. 64
-6483, Japanese Utility Model Application Publication No. 63-58166, and the like.

Their basic configuration is: a latch case that has a horizontal square tubular shape with a front opening and has a mounting section; a latch sliding body that is slidably housed in the latch case and has a latch action section on the front surface; a latch drive spring body that is housed between the cylindrical bottom of the case and the rear part of the latch slider and urges the latch slider forward; and a latch drive spring body that is disposed between opposing surfaces of the latch slider and the latch case. A cam mechanism consisting of an eight-shaped cam groove formed on one opposing surface and a follower equipped with a driven pin that follows the cam groove is interposed, and the latch slide When the moving body is pushed in the backward direction, the driven pin is able to lock and release the locking action in the heart-shaped inner circumferential wall recess of the cam groove.

<IIA to be Solved by the Invention> However, all of the above-mentioned configurations are provided with a step for the purpose of preventing all the cam grooves from returning from the locking position, and the follower is not moved to the step. A pin biasing spring body was required to bias the follower in the groove direction to ensure engagement of the pin.

Further, a locking sound (snapping sound) was generated each time the driven pin was locked or released, that is, each time the pin was locked to the stepped portion. Further, since the pin biasing spring rest is required, the structure becomes relatively complicated, and the number of parts increases, or it is necessary to form a spring body integral with the latch case.

In view of the above, an object of the present invention is to provide a push latch device that has a simple structure and can eliminate snapping noise.

Means for Solving the Problems> In order to solve the above problems, the present invention has made extensive efforts in development, and as a result, it is possible to solve the problems without forming a retaining step on the bottom surface of the cam groove on the sliding surface. We have found that the action of the push latch can be sufficiently suppressed, and have come up with a push latch device having the following configuration.

A latch case having a horizontal square cylindrical shape with a front opening and having an attachment part; a latch sliding body that is slidably housed in the latch case and concentrates a latch action part on the front side; a cylindrical bottom part of the latch case; The latch drive spring body is housed between the rear part of the latch sliding body and urges the latch sliding body forward, and the cam mechanism is disposed between the facing surfaces of the latch sliding body and the latch case. A cam mechanism consisting of a heart-shaped cam groove formed on one opposing surface and a follower equipped with a driven pin that follows the cam groove is interposed, and the latch sliding body is pushed in the backward direction. In a push latch device configured such that the driven pin can repeatedly engage and release the engagement with the heart-shaped inner circumferential wall recess, the groove bottom of the cam groove is a flat path, and the follower is configured to: It is characterized in that a driven pin is provided around the rotating body which is pivotally supported on the opposing surface on the opposite side to the side where the cam groove is formed.

<Example> Hereinafter, one example of the push latch device of the present invention will be described.
- Explanation will be given based on Figure 6.

(1) It is assumed that the structure consists of the latch case 1, the latch sliding body 5, the latch drive spring body 11, and the cam mechanism. Each part of the latch case 1, latch sliding body 5, and cam mechanism is usually made of synthetic material such as polyacetal or polyamide.
Manufactured using 1MWI material by injection molding, etc.

■The latch case 1 has a horizontally installed rectangular cylindrical shape with a front entrance and has mounting parts (flange parts for mounting) 2, 2 on both sides. The mounting flange portions 2.2 each have threaded holes 3 for mounting machine screws. Furthermore, a cylindrical spring Wi4 is formed at the bottom of the cylinder of the latch case 1.

(2) The latch sliding body 5 is slidably housed in the latch case 1 and has a latch action portion on the front surface. Specifically, a spring seat 7 is formed in the rear part of the sliding frame 6, and a magnet member 1o, in which both sides of a magnet 8 are sandwiched between ferromagnetic plates 9, is housed in the front part. The latch action part is not limited to a magnetic member, but may be a member that performs another latch action, such as a strike catch described in the above-mentioned Japanese Patent Laid-Open No. 64-6483.

■The latch drive spring body 11 is housed between the cylindrical bottom of the latch case 1 and the rear part of the latch sliding body 5, and urges the latch sliding body 5 forward.In the example shown in Figure 0, the spring body 11 is a compression coil spring. , is arranged between the latch case 1M section and both spring seats 4.7 at the rear end of the latch sliding body 5. The spring body is not limited to a coil spring, but may be a leaf spring or the like.

(2) The cam mechanism is interposed between the facing surfaces of the latch sliding body 5 and the latch case 1, and includes a heart-shaped cam groove 13 along the sliding surface, and a driven pin 16 that follows the cam groove 13. It consists of a follower 15. By the cam mechanism, the latch sliding body 5 is pushed in the backward direction, and the driven pin 16 is locked in the recess e1 of the heart-shaped inner circumferential wall 13g of the cam groove 13.
The unlocking operation can be repeated.

In other words, a cam groove 13 is formed in the bottom cover plate 1a of the latch case 1, and a plate-shaped follower 15 equipped with a follower pin 16 guided by the cam groove 13 is rotatable on the opposite surface of the latch sliding body 5. The 0-rotation range supported by the latch may be less than 90 degrees.The cam groove may be formed on the latch sliding body side, and the follower may be formed on the latch case side.

Here, the biggest difference from the conventional mechanism is that the groove bottom 13b of the cam groove 13 is a flat path. Since the groove bottom 13b of the cam groove is a flat path, there is no need for a pin biasing spring body which is essential when the driven pin 16 has a stepped portion at the groove bottom.

Note that the shape of the cam groove 13 is similar to that of the cam groove 13 of the driven pin 16.
In order to ensure that the locking/unlocking operations for the recessed portion e1 of the heart-shaped inner circumferential wall are performed reliably, the configuration shown in FIG. 3 is preferable (the following description is based on the plan view of FIG. 3).
.

That is, the depression e! , the pin 4 person side has an M slope, and the pin pressure side has a steep slope (approximately upright). In addition, the first bay-shaped recess d1 of the heart-shaped outer periphery H413c, which the pin abuts before the pin locks, and the above-mentioned The pin hits when releasing the lock! The connecting wall with the J2 bay-shaped recess d2 is a ridge! f is located on the dl side from the center of the depression e1, and with the ridge line 1 in between, the d1 side is a steep slope (substantially upright) and the d2 side is a gentle slope.

(2) Next, use the push latch device above! ! ! Describe the cherry blossoms.

As shown in FIG. 6, the push latch device is attached to the inner wall 21 of the box body 21 with a lid using machine screws. - On the other hand, the latch receiver 23 made of an iron plate corresponds to the push latch device.
is also attached to the lid body 25 with machine screws.

When the open door body 25 is closed, the latch sliding body 5 moves back while elastically contracting the spring body. Then, the latch sliding body 5
The driven pin 16 of the follower 15, which is pivotally supported by the cam groove 13, moves in the direction of the arrow (backward direction) in FIG. The latch sliding body 5 hits the third curved concave wall d1 and is unable to retreat any further (position shown by the two-dot chain line in Fig. 3A).
Then, when the pushing force on the latch sliding body 5 is released, the driven pin 16 moves forward due to the biasing force of the spring body 11 and locks in the heart-shaped inner circumferential wall depression e1 (FIG. 3A).
At this time, the latch receiver 23 and the magnet member 10 of the latch device are in a latched state due to magnetic action, and the closed state of the screen is maintained.

Next, when opening the folding screen, when the free end of the door body 25 is pushed in, the driven pin 16 retreats and moves away from the heart-shaped inner periphery M recess 6 and into the second bay-shaped recess of the heart-shaped outer periphery wall 13c. C$ hits the wall d2 and the latch sliding body 5 cannot retreat any further.
3B), when the pushing force on the latch sliding body 5 is released, the latch sliding body 5 moves to the spring body 11.
Due to the urging force, the driven pin 16 moves in the direction of the arrow (advance direction) along the heart-shaped outer peripheral wall 13c of the cam groove 13, reaches the tip recess d3 of the heart-shaped outer peripheral wall 13c, and stops. At this point, the latch sliding body 5 is in a protruding state, and the i-body 2
5 is lifted up, and the lid body 25 is in a slightly open state. Therefore, in order to open the lid, it is sufficient to pull up the lid body 25 against the magnetic force.

The locking/unlocking operation of these driven pins with respect to the heart-shaped inner periphery M recess e1 is such that the driven pin 16 mostly moves along the outer peripheral side wall of the cam groove and touches the groove bottom of the cam groove. Since there is no step, if operated quietly, no step (snap sound will be generated when locking) <Operations and Effects of the Invention> The push latch device of the present invention can move the locking step of the cam groove as described above. At the same time, the driven pin presser spring body for securing to the engagement step is also eliminated.As a result, the structure of the push latch device as a whole is simplified, and as a result, 1.
The number of parts can also be reduced. Furthermore, when the driven pin is locked to and released from the heart-shaped inner circumferential wall recess, and because the driven pin is not spring-biased, it does not lock to the locking step, and when operated quietly, there is almost no snapping sound. Does not occur.

Therefore, it is suitable as a push latch device for a door in a place where quietness is required, such as a bedroom or a hospital room.

[Brief explanation of drawings]

The government shows an embodiment of the push latch device of the present invention, and FIG. 1 is a cross-sectional view taken along line A-B-C-D-E-F in FIG. 2, and FIG. 2 is a cross-sectional view taken along line G-H in FIG. -I-J- is a cross-sectional view taken along the line 's3 Figure A-B is a cross-sectional view explaining the action (■-■ line part in Figure 4), 's4 is a cross-sectional view taken along the line rV-rV in Figure 2, Figure 5 is an overall perspective view, and FIG. 6 is a perspective view of a temporary box with a push latch device attached. DESCRIPTION OF SYMBOLS 1... Latch case, 2... Mounting part, 5... Latch sliding body, 6... Sliding frame body, 10... Mabnet member (latch action part), 11...
・Latch drive spring body, 13...Cam groove, 13a...Heart-shaped inner circumferential wall, 13b...Groove bottom, 13c''・Heart-shaped outer circumferential wall, 15...Follower, 16... Driven pin, el...Heart-shaped inner circumferential wall recess. Fig. 1 Fig. 3 Fig. 311

Claims (1)

[Scope of Claims] A latch case having a horizontal square tubular shape with a front opening and having a mounting portion; a latch sliding body slidably housed in the latch case and having a latch action portion on the front surface; and the latch case. a latch drive spring body that is housed between the bottom of the cylinder and the rear part of the latch sliding body and urges the latch sliding body forward; and a cam mechanism that is disposed between opposing surfaces of the latch sliding body and the latch case. A cam mechanism consisting of a heart-shaped cam groove formed on one opposing surface and a follower equipped with a follower pin that follows the cam groove is interposed, so that the latch sliding body moves in the backward direction. In a push latch device configured such that the driven pin can repeatedly lock and release the locking action in a heart-shaped inner circumferential wall recess of the cam groove when pushed in, wherein the groove bottom of the cam groove is a flat path. A push latch device, wherein the follower includes a follower pin around a rotating body that is pivotally supported on an opposing surface opposite to the side where the cam groove is formed.